Digital electronic branch exchange unit



FIG. 1 is a top front right side perspective view of a digital electronic branch exchange unit showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a right side elevational view thereof, a left side elevational view being a mirror image of the right;

FIG. 5 is a rear elevational view thereof; and

FIG. 6 is a bottom plan view thereof. 

The ornamental design for digital electronic branch exchange unit, as shown and described. 